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In order to eliminate the volume defects such as keyhole and cavity in friction stir welding (FSW) joint, a new technique called active-passive filling friction stir repairing (A-PFFSR) was put forward. In this study, choosing AZ31-B magnesium alloy as research object, repairing experiment of keyhole was mainly investigated. The results show that the keyhole can be successfully repaired and no defects...
The effect of Al, Zn, and Gd respectively on the microstructure and mechanical properties of Mg alloy Mg-Sn-Li (the base alloy) is performed. Our results reveal that with Al addition (Al-modified alloy) or Zn addition (Zn-modified alloy), the secondary dendrite arm spacing of the primary α-Mg phase is refined and no new phase is formed. Gd addition (Gd-modified alloy) results in the formation of needle-like...
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